18972635 has 8 divisors (see below), whose sum is σ = 24836976. Its totient is φ = 13798240.

The previous prime is 18972623. The next prime is 18972637. The reversal of 18972635 is 53627981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18972635 - 2¹⁰ = 18971611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18972592 and 18972601.

It is not an unprimeable number, because it can be changed into a prime (18972637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172424 + ... + 172533.

It is an arithmetic number, because the mean of its divisors is an integer number (3104622).

Almost surely, 2^18972635 is an apocalyptic number.

18972635 is a deficient number, since it is larger than the sum of its proper divisors (5864341).

18972635 is a wasteful number, since it uses less digits than its factorization.

18972635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344973.

The product of its digits is 90720, while the sum is 41.

The square root of 18972635 is about 4355.7588317077. The cubic root of 18972635 is about 266.7119966343.

The spelling of 18972635 in words is "eighteen million, nine hundred seventy-two thousand, six hundred thirty-five".